Apparatus for selective wireless telegraphing.



F. G. SARGBNT. APPARATUS FOR SELECTIVE WIRELESS TELEGRAPHING.

APPLICATION FILED NOV. 21,1913.

Patented July 7, 1914.

2 SHEETSSHEET 1.

J rzioz SWSW P. G. SARGENT.

APPARATUS FOR SELECTIVE WIRELESS TELEGRAPHING.

APPLICATION FILED NOV.21,1913.

nil/n- WW6! 7W Q 1 FREDERICK G.

sanenivr, or WES'I'FORD, MASSACHUSETTS.

APPARATUS FOR SELECTIVE WIRELESS TELEGRAPHING.

Specification of Letters Fetent.

Patented July 7, 1914..

Application filed November 21, 1913. Serial No. 802,189.

To all whom it may concern:

Be it known that I, FREDERICK G. SAR onn'r, a citizen of the United States, residing at \Vestford, in the county of Middlese t and State of Massachusetts, have invented a new and useful Apparatus for Selective.

\Vireless Telegraphing, of which the follow ing is a specification.

This invention relates to a system of communicating or telegra 'ihing, and for other purposis, particularly adapted for use with wireless apparatus.

The principal objects of the invention are to secure secrecy and sim lify both the send-- in and receiving operations.

The invention also involves improvements in features of construction and combinations of parts as will appear hereinafter.

Reference is to be had to the accompanying drawings in which Figure 1 is a diagrannnatic elevation of a sending station. Fig. 2 is a similar view of a receiving station adapted to cooperate therewith. Fig. 3 is a side elevation showing the delails'of one of the keys of the sending station. Fig. i is a similar view showing another position of the parts. Fig. 5 is a plan of a sending dial of modified form. Fig. 6 is a similar view of another form of a receiving dial with a diagrammatic illustration of connections therewith for operating; a typewriter. Fig. 7 is a similar view showing an automatic arrangement for operating the t v ')ewritcr. Fig. 8 is a view of one of the dials showing a modifi cation, and Fig. 9 is a similar view showing another modification.

Referring to FifS. 1. and 2 it will be seen that at each station there are two members one rotary and one stationary, namely a dial 10 and a pointer or indicator 11. For the, purpose of this invention either the dial or the pointer may rotate and in the form 7 shown in Figs. 1 and 2 the dial is intended to be stationary and the indicator to rotate. The means for rotating the rotatable member is not shown herein but any well known form of clock work or other rotating mechanism c n be employed. It is intended to have the rotation at the several stations synchronous. For thi purpose illt instruments can be set or nlijlidfll by the time signals sent out by the vv'lfiliw-l stations every day or they can he provi-.; with extreme c accurate instruments s rcct time with Lflili utilul.

will keep con m At any into;

when commencing to oierate, the stations can be adjusted to see if they are in unison by any simple means.

With the parts arranged as so far described, the apparatus can be used with any ordinary sending and receiving system, either wireless or otherwise.

This mode of operation is as fo1lows:--The station wishing to talk calls the other station or stations in any usual Way. After receiving the answer they can, if necessary compare their dials to see that they are in unison and if not, adjust them so that they will be. The several dials. being provided with series of characters arranged in the same order thereon. and rotating, in the same direction, or the indicator rotatin% in the same direction as the case may be. t 1e operators at the stations can give a pro-arranged signah'as for example a and if the signal is received at the stations uhon the indicators and dials are at that point it will be understood that all the instruments are in unison. The sending operator then sends signals by giving any predetermined signal, as a dash or dot, over the apparatus when the indicator 11 indicates the desired letter or character on his dial. The instruments being in unison and the signal bein sent instantaneously the receiving station will get the signal when its indicator showing the same letter or Chilb actor. it will be understood, of course, that ordinarily the same signal will be sent over the wireless apparatus each time so that to any station not having this apparatus the cormnunications from the sending station would appear to be a repetition of the same signal but at unequal intervals.

This system can be used also in actual connection with the wireless apparatus now in use and for this purpose the ifollowin connections are shown. On each of the diafs ii) there are a series of contacting pins 12 corresponding in number with the characters on the dials, and the indicator 11 contacts with these periodi rally as itrotales. In Fi s. 1 and 2 the indicator is shown as having a projection '13 for this pin-pose and the pin with which this projm'tlm! is shown in contact in Fig. 1 would present the character ."i. or 1. From each of tinepia ii a conductor 14 is taken oil which is connecod with a push button in having a rhaiasicr thereon correspond- In. the nacterwhich the indicator ion 1h. 4 pin 12 is in contact with lot sm le-.." a

it. These push buttons 15 thus constitute a key board. Each one is provided with a contact 16 which engages bar 17 when the key is operated. This bar is connected with an electromagnet 18 connected with a battery 19. This in turn is connected with the metallic case 20 in which the dial is located, which is electrically connected With the shaft 21 with which the metallic indicator 11 rotates. Consequently as the indicator rotates it periodi -ally closes each of the several circuits one at a time, no two ever being closed at the same time. The operation of any one of the keys 15 of the key board closes that circuit at one point and then the circuit is completed whenever the indicator gets around to the position which indicates the same character. Then the magnet 18 is energized, a contact 22 is made, and. a current is setup in the usual prin'iary 23 and secondary 2-1. The circuit in which the secondary circuit 24 is located is provided with the usual con; denser 25, oscillators 2G, aerial 27, and tuning coil 25".

The receiving station is shown of a well known type having the aerial 28, coil 29, condenser 30, and detector 31. It is also provided with a telephone receiver 32 and this circuit is connected up with the dial at this station in a manner similar to that described at the other station, but there is no key hoard. One end of the circuit is connected with the case of the dial so that it is constantly connected with the indicator and the other end of the circuit is divided into as many lines as there are characters and one connected with each of the pins 12.

it will he understood of course that while I have described a complete sending station and a complete receiving station sepaate from each other, ordinarily each station will actudly be provided with both the receiv ng and the sending mechanism. In this case the sending station is connected up for -ccr ing purposes by simply switching out the ba tery 19 and connecting these Wir s to a telephone circuit located at what I have called the sending tation. In either case the telephone circuit is closed only when the dial and indicator are in the same relative position as that in which they are in at the sending station. At other times nothing can be heard on the telephone receiver as its connections are broken. It will be "i rstood, of course, also that the telephone eceiver can be dispensed with and a concrcr used in the ordinary way for operating! the relay. The relay then can operate lights or other apparatus for sig nals or other desired kind oi communication or purposes. It will be understood. of course, also that the clock mechanism for operating the dials or indicator can be made to run onlyfor'a definite period of time if desired before requiring rewinding, or that the same can be made on the same principle as a stop watch so that it can be stopped and. started as desired to save some of the rewinding. lVith a stop Watch arrangement itv can be arranged to start always on a definite character and then the device can be employed to place the several stations in unison. It will be understood, of course, that the clock work can be regulated so that the hand or dial can be made to revolve at any convenient speed, dep nding upon the size thereof and the distance apart of the characters.

In connection with Figs. 1 and I have referred to the connection of the contacts of the branch circuits 1- by the operating push buttons as being accon'iplished by contacts 16 engaging a bar 17. This will result in the sending of a simple signal equivalent to a dot or dash of the telegraphic code. I prefer, however, to send a more distinctive signal each time and preferably the same one by each push button so that to a person not having at hand a receiving dial. the signals received would appear to be all alike but at varying intervals apart. For this purpose the construction shown in Figs. 3 and 4 is a convenient one. In this case each push button 15 is mounted on a rod 41 vertically reciprocatingon a bracket 12. On a stationary conducting bar 43 insulated from the brackets 42, are the spring contacting bars 17 which are insulated on the top. This bar 43 is connected with the wire Which goes to the electro-magnet 19. On the rod 41 are a. series of teeth 16 and the contact 16. The teeth 16 are narrow and the contact 16 is long. The former represent dots and the latter a dash in the tclegrra phic code. It will be chvious of course that any des 'cd con'ibinati n of dots and dashes can be used. In the present case it is intended to give a signal orrcspi'inding to four dots and a dash. ()n the back of the rod 41 is a tooth H. .i latch 45 is pivoted over it and lo rated in a position to engage, it. An clertroinag net 46 is mounted in a shunt in each of the circuits 14 so that when that shunt is closed the latch '15 will be drawn toward the magnet out of the path of the projection 44.

The operation of the device is as follows: When the operator desires to send a signal, he presses down the button 15 corresponding to that signal. The latch 45 acting by ravit in the form shown, latches that but ton down. It will stay down until the corrcspoiulino shunt circzii 11 is closed at the dial and then the latch 45 will be drawn away to release the rod 41. This periuitsa spring- 47 to raise the bar. As it raises it the contact is made at 17, through the electroinagnct 18 and that signal is sent through the aerial 2 7. It Will be under- 29 construction shown in Fig. 5.

30 in i' it f. 5.

35 rotating dial magnets and the release them, because the other push buttons are in elevated position. It will also be understood, of course, that when pressing down the push button no signal is sent. This is because of the insulam tion on the top of each contact 17. Moreover, as magnet 18 is connected up in series with each of the circuits 14 there could be no signal unless one of these circuits 14 Was closed by the indicator and that one must be the one connected with the push button which was being depressed in order to send a signalev'en if this insulation were not present.

A similar result can be obtained by the y In this case the indicator a light spring 48 and adj a- .eent to each letter on the dial 49 which r0- tates in this ase, is a contact iece 50 having short and long notches arranged as desired.

In the case of Figs. 3 and 4 I have described the. l

as arranged exactly the same for -h bu In this c however, ,c'cmcnt of dots and dashes can be employed and l have shown it so 'lheso can be arranged accordin to the Morse code, of course, Or in any other desired way. In this case the conducting casing 51, from which the spring 48 is insulated, is electrically c mncctcd with the and also with the battery 19 and an ordinary ush button 15. The recria ing circuit in this case may be connecti-il if u ed to an ordinary Morse tape Inarliinr, no fiho'un. In this case, now assuming the cmistruction in his. 5 to act as a rccci'xiog utiou, it will be seen that when a signal is re eived, the operator presses th push button 13" to complete the circuit of th." halt and dial with the Morse tape mai'ut'. E nus-1 the selector will. then print the i dash s which are cont rolled by the d al and not by the sending dial. torn: shown in Fig. (5, which is a ivin Station, a typewriter is ii'idicatcd ucyn each one designed to he op- A an clcrlroniagnct 51-3. liar-h of the r elm-tr:magnets is in a ltil'vuit connected curl to the casing of the dial and at "Hilllltflt'tl to a pring 5i. There :35 one of these springs for each letter and or which the dial rocircuils is closed at when a signal i.- re

the r nning dial an indicator 5:")

u then: 1 .turn as 'ihus each of the this point in turn. Vow

(rived. the operator plt'h i g down on the he 5" and completes the c rh- -ti-onzagnct 53, whivis in the lH'iliit'l ci. :uit that is being cl sed by the indicator when this key of the typewriter is dcpr' -cuit through the The Qpewriter is arranged to print on a strip of pa er or ribbon and the result is similar to t at taking place in the construction shown in Fig. 5 when using the Morse tape machine.

Instead of usin the key 15 in Fig.6, the device can be ma e self-operative by using a detector 57 connected up as shown in Fig. 7, with the aerial 28, condensers 30, electromagnets 53, and springs 54.

In Fig. 8 another construction is shown in which the dial 35 rotates and is provided with a cover 30 having openings 37 therethrough constituting an indicator so that, it will be simpler for the operator to tell which character is in the position for communication. The keys and contacts are used as in Fig. l.

In Fig. 9 another arrangement is shown in which there'is a relative rotation between the dial 38 and the cover 89, a space 40 being provided for the purpose of designating the position of the letter called. This is merely an indicator without electrical connections.

In the use of this device each party has one of the instruments and by means of a wireless signal system of any desired character or kind, they can determine when the two devices are operating in synchronism. For example it can be understood that the sending station will send out a signal when the letter A is behind the space 40 and then the other stations 'will adjust their devices to be at the same point. Then the station giving the signals can signal the other station or stations whenever any desired letter or number is in the space 40. The receiving stations will, of course, know that fact and thus understand the message.

It will be understood of course that this principle can be used with instruments for giving an audible signal instead of a visual one or in addition to it. For example, where a Morse recorder is used the signals can be given by a sounder, or the like.

\Vhcthcr onnected up as described or used simply as a. selective signaling device with out the electrical connections, it is obvious, that such an arrangement will prevent the reading of the messages by any party not having such a device and yet the operations of receiving and sending are simpler than they arcuith the types of Wireless apparatus now in use.

Although have illustrated and described only a lcwmodifications of the invention, 1 am aware of the fact that other changes can he made therein by any person skilled in the wt without departing from the scope of the nvcnl ion as expressed in the claims. There- 'orc. I do not wish to be limited to all the lrluils herein shown and described, but

What i do claim is:

l. in a wireless telegraph apparatus, the comhiruition of a set of dials and indicators rotating said dials and indicators at each station relatively to each other, synchronously and continuously, each dial being provided with a series of characters arranged thereon in the same order, a series of contacts corresponding one with each character, circuits connected with said contacts, means for closing each circuit when the indicator of that dial indicates the character corresponding to the contact connected with that circuit, manually controlled means at one station for causing a predetermined dot and dash signal to be sent while any selected one of said circuits is closed, and wireless apparatus connected with said circuits.

2. In a' wireless telegraph or signaling apparatus, the combination of a set of dials and indicators, one at each station, means for relatively rotating the dial and indicator of each station synchronously with the rotation of those of the other station or sta tions, each dial being provided with a series of characters arranged thereon in the same order at the several stations and with a series of contacts corresponding with said characters,- means for engaging said contacts'in the same order at the several stations the rotation is carried on, circuits connected with said contacts, a key-board at the sending Stiltll)". having push buttons,

pne connected with each of said circuits, and

with, one for each push button, means connected with the dial and indicator for closing an open contact in each branch circuit periodically, and means connected with each push button for intermittently closing and opening a second contact in each branch circuit whereby when a push putton is depressed the circuit through that branch will be completely but intermittently closed during each complete operation of the device for the purpose of giving a dot and dash signal.

4. In an apparatus of the character described, the combination of a push button having a series of contacts thereon, a contact member adapted to engage said contacts in order as the push button is moved, a circuit. connected with the last named contact for the purpose of giving a signal, a. branch circuit, means controlled by said branch circuit for releasing the push button and permitting it to move and make the desired contact, and automatic means for operating said releasing means.

5. In an apparatus of the character described, the combination of a reciprocable rod, a push button thereon, a spring for moving the push button and rod in one direction, a latch for holdingthe push button and rod in one extreme position, electromagnetic means for releasing the latch to allow the spring to act, and a contact member in position to be engaged by the red when it moves, said rod having a series of contacts thereon for engaging the contact member.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

FREDERICK G. SARGLNT;

W'itnesses llnrnznsAn SARGENT, l\/L\RY H. SARGENT. 

